New York Times columnist Nicholas Kristof, who won Pulitzer Prizes for his coverage of Tiananmen Square and Darfur, speaks about people making a difference around the world. [6:30 p.m., Castro Theatre, 429 Castro St., S.F.]

Murders in Juarez: The ongoing murders of female factory workers in Ciudad Juarez, Mexico, is the subject of a panel discussion, including the mother of one of the victims. [2:10 p.m., IR Briefing Room, HSS Building, 1600 Holloway Ave., S.F.]

Local activities

Free museum day: The first Tuesday of the month is a free day at several museums around The City. [9:30 a.m.-5:15 p.m., De Young Museum, 55 Hagiwara Tea Garden Drive, S.F.; 9:30 a.m.-5:15 p.m., Legion of Honor, 100 34th Ave., S.F.; 11 a.m.-6 p.m., Museum of Craft and Design, 2569 Third St., S.F.]

Film screening: Bernal Heights Outdoor Cinema finishes up its 2014 season with a selection of short films, including "The Last Black Man in San Francisco" and "Bug Eyed." Filmmakers will be on hand to answer questions. [6:30 p.m., Mission Cultural Center for Latino Arts, 2868 Mission St., S.F.; www.bhoutdoorcine.org]